Performance Horse Specialists

Jack Snyder, DVM, PhD, DACVS - Veterinary Surgeon

Jack Snyder brings both international acclaim and extensive expertise to Circle Oak, where he now bases his practice. Dr. Snyder completed his residency and later assumed a faculty position as an equine surgeon at the University of California Davis School of Veterinary Medicine. The majority of his practice has focused on sport horses and he has held roles at the highest levels of international competition, including roles as distinguished as the official on-site veterinarian for the Olympic Games on five separate occasions.   Dr. Snyder enjoys working with trainers and riders, worldwide, to help them develop and maintain stables of equine athletes that are sound and fit for rigorous competition at the highest levels.  Upon retirement from academia, he chose to join Circle Oak due to our shared vision of full-service, state-of-the art sport horse veterinary care. Dr. Snyder’s diagnostic expertise and ability to see the ‘big picture’ dovetail with Circle Oak’s whole horse approach, our full array of diagnostic tools and our commitment to professional rehabilitation. Dr. Snyder is looking forward to working with the Bay Area equestrian community while maintaining an international practice.  (Read Dr. Snyder’s full biography)

To consult with Dr. Snyder or to schedule an appointment, email or call us at (707) 738-2529



Carrie Schlachter, VMD, DACVSMR - Medical Director

Carrie Schlachter is the visionary behind Circle Oak Equine’s state of the art equine medical and surgical facility. She graduated from the University of Pennsylvania School of Veterinary Medicine and New Bolton Center, where she received the Charles F. Reid Clinical Excellence Award for Sports Medicine and Imaging as well as numerous scholarships. Dr. Schlachter grew up riding horses in the competitive ‘A’ circuit on the East coast and has almost 35 years of experience with horses as a rider, veterinarian and owner. Dr. Schlachter is an active learner and participates in numerous advanced imaging and rehabilitation educational workshops every year and recently received her board certification in equine sports medicine and rehabilitation through the ACVSMR. Her practice focuses solely on sports medicine, with special emphasis on digital diagnostics and rehabilitation.  Dr. Schlachter oversees all rehabilitation and fitness programs at Circle Oak, working with owners, farriers and referring veterinarians in a team approach.    (Read Dr. Schlachter’s full biography)

To consult with Dr. Schlachter or schedule an appointment, email or call us at 707-738-2529


Sarah Puchalski, DVM, DACVR - Diagnostic Imaging Consultant

Sarah Puchalski has developed an international reputation as an expert in equine diagnostic imaging and now bases her practice at Circle Oak. She is a Canadian and was educated at the University of Saskatchewan and completed her diagnostic imaging residency at the University of California, Davis. As an assistant, and later associate, professor at the UC Davis School of Veterinary Medicine (2005 – 2013), Dr. Puchalski focused on didactic and clinical teaching, research and clinical radiology. Her research interests surround the use of novel imaging techniques for the diagnosis of lameness conditions in equine athletes.   Dr. Puchalski opened her consulting practice in 2013, and consults remotely for numerous practices across Europe, Australia, the US and Canada.  At Circle Oak Equine, she reads all of the radiographic and MRI images.  Her goals are to continue to elevate the quality and role of diagnostic imaging in equine medicine through continuing education, research and by offering consulting services to equine veterinarians throughout the world.  (Read Dr. Puchalski’s full biography)

To consult with Dr. Puchalski or to schedule an appointment, email or call us at (707) 738-2529


Anthony DeRouen, DVM, DACVR - Diagnostic Imaging Consultant

Anthony DeRouen brings additional equine imaging expertise to Circle Oak. He is a Diplomate of the American College of Veterinary Radiology with a special interest in equine cross-sectional imaging.  Dr. DeRouen grew up in Southern California on the doorstep of Joshua Tree National Park and developed a passion for the outdoors and animals at an early age. As a child he loved ranch work, raising guide dogs, and working for a local equine veterinarian. Dr. DeRouen attended Colorado College in Colorado Springs, graduating with high honors in 2006. He then went to University of California, Davis for his veterinary degree, graduating in 2011. During veterinary school, he earned achievement awards for excellence in Large Animal Radiology and Large Animal Surgery. He completed an equine internship in Glenwood Springs, CO, following the awarding of his degree. Following the internship, Anthony returned to UC Davis for his radiology residency. During his residency, Anthony published research on equine cervical spine malformations and their clinical relevance and achieved board certification in 2015. Anthony is excited to live in Sonoma County and join the team at Circle Oak, where he is available for year-round consultation.


To consult with Dr. DeRouen or to schedule an appointment, email or call us at 707-338-2529


Natalie Zdimal, DVM - Senior Associate Veterinarian 

 Natalie comes to Circle Oak from Bayhill Equine in Redwood City, CA, where her practice focused on lameness, fitness and rehabilitation, using advanced techniques to diagnose and treat equine athletes.  Prior to that she was an intern veterinarian at Alamo Pintado Equine Medical Center in Los Olivos, CA, and has experience in a hospital environment and managing critically ill patients. Before veterinary school, Natalie also worked as a technician at the University of California, Davis, in both the large animal ultrasound and intensive care departments.  Natalie received her undergraduate and doctor of veterinary medicine degrees from the University of California, Davis and has completed a number of externships all over the world, including veterinary hospitals in Dubai, Europe and the United States.  In 2010 she was the UC Davis student representative at the World Equestrian Games in Lexington, Kentucky, where she assisted the FEI and WEG veterinarians during the competition.  Like the other veterinarians at Circle Oak, Natalie loves to learn and has completed additional certifications and attended international symposia as she strives to stay at the forefront of equine sports medicine.  Growing up in Northern California, Natalie competed in three-day eventing and dressage. Her passion later took her to England where she spent two invaluable years training and competing with her horses.  Natalie’s husband Joel is a winemaker and has been making wine in the Napa Valley region since 2003.  They are very excited to return to the North Bay, where they now make their home in Sonoma. Outside of work, Natalie enjoys outdoor activities and spending time with her two young daughters Cézanne and Ésme-Anne. 

To consult with Dr. Zdimal or schedule an appointment, email or call us at 707-738-2529


Courtney Lewis, DVM - Associate Veterinarian

Dr. Courtney Lewis joined the Circle Oak Equine family in 2015 as our veterinary intern, upon graduation from the University of California, Davis Veterinary School. Dr. Lewis earned her undergraduate degree in Genetics at UC Davis, where she participated in both human and equine veterinary research and was a veterinary technician at Circle Oak Equine. She grew up riding in Marin County, competing in the hunter/jumper circuit. It is not surprising that with this background, Dr. Lewis quickly developed an interest in equine medicine, particularly lameness and imaging, during her vet school years. After two years of internship, Dr. Lewis was promoted to Assoicate Veterinarian in early 2017.

To consult with Dr. Lewis or to schedule an appointment, please email or call us at 707-738-2529




Lori Bidwell, DVM, DAVCAA - Anesthesiologist 

Dr. Lori Bidwell is a 2001 graduate of Michigan State University, a diplomate of the American College of Veterinary Anesthesia and Analgesia and a certified veterinary acupuncturist and Tui Na Practitioner.  After an internship year at Rood and Riddle Equine Hospital in Lexington, Kentucky, Dr. Bidwell completed an anesthesia residency at Michigan State University.   She then moved to Lexington to act as the head of anesthesia for Rood and Riddle Equine Hospital.  In 2009, Dr. Bidwell moved to St. Kitts in the West Indies to teach at Ross University School of Veterinary Medicine.   Dr. Bidwell was then invited to return to Lexington to develop and head the anesthesia service of a new practice called Lexington Equine Surgery and Sports Medicine.   Due to a family illness, Dr. Bidwell returned home to Michigan State University in 2012 as an Assistant Professor in Anesthesia and the Equine Sports Medicine Service.   In August of 2015, Lori and Duncan Peters, DVM, MS, DACVSMR founded East West Equine Sports Medicine.  A practice that involves consulting and covering veterinary services for hunter/jumper circuits on the West and East Coasts and in Lexington, Kentucky.  Dr. Bidwell also consults for equine practices in the Unites States and speaks and teaches nationally and internationally

Dr. Lori Bidwell is Circle Oak Equine's anesthesiologist